Wire-stitching machine



Dec. 4, 1934. H T, MCCLURE 1,983,384

WIRE STITCHING MACH'INE Filed Aug. 19, 1933 3' Sheets-Sheet 1 Dec. 4, 1934. H, T. MCCLURE 1,983,384

-wIRF STTCH'ING MACHINE.

Filed Aug. 19, 1933 3 Sheets-Sheet 2 Dec. 4, 1934. H. T. MCCLURE 1,983,384

WIRE STITCHING MACHINE Filed Aug. 19, 1953 3 Sheets-Sheet 5 Patented Dec. 4, 1934 UNITED STATES PATENT' OFFICE 1,983,384 WIRE-STITCHING MACHINE Harry T. McClure, Warwick, R. I., assgnor to Boston Wire Stltcher Company, Portland, Maine, a corporation of Maine Application August 19, 1933, Serial No. 685,829

13 Claims. (Cl. 1 2) me ....v......ion relates to stapling or wireillustrating the staple-forming and driving stitching machines for stitching book signatures, mechanism in position at the end of the staplefastening articles together, and for various other driving operation; purposes. The present invention is particularly Fig. 4 is a transverse sectional view on line 5 concerned with wire-stitching machines having 4-4 of Fig. 3 illustrating the mounting of the 30 means for feeding wire from a supply, cutting it anvil-actuating means on the stitcher-bonnet; into lengths, bending the wire to form staples Fig. 5 is a perspective view showing the acand applying the formed staples to the work. tuating lever for the anvil-oscillating means Such a; type of stitching machine is illustrated with the parts connected thereto illustrated in and described in United States Letters Patent dot-and-dash lines; and

No. 1,252,011 of January 1, 1918, wherein the Fig. 6 is a perspective view of the wire-holdwlre is fed to a rotary swivel or anvil, a length ing and staple-forming anvil. severed from the wire and the ends of this Referring rst to Fig. 1 of the drawings, the. length bent downwardly at the sides of the stitcher-head or bonnet which contains the anvil to form the legs of the staple. In this staple-forming and driving mechanism is of a 7. type of stitching mechanism the wire is fed type similar to that disclosed in the patent above vertically to insert it into a receiving groove or referred to. 'Ihe head or bonnet 2 is constislot in the anvil, whereafter the anvil is rotated tuted in the form of a substantially channelto position the wire horizontally whereby the shaped, box-like casing which is mounted at the ends of the severed length may be bent downend of a horizontally extending hollow arm 3A ym wardly to form the staple which is thereafter constituting a part `of the frame of the stitchdriven into the work. ing machine. The arm 3 projects forwardly The present invention is concerned with imfrom a column or similar upright which also proved means for oscillating the anvil during the carries a work-support or rest extending horireciprocation of the bender-bar or staple-former zontally below the arm in position to receive 80 and the staple-driver which applies the formed the articles to be stitched. In the present draw; staple to the work. ings the work-support is indicated at 4 as com- One object of the invention is to provide prising means for mounting a clincher-device, actuating means for the forming anvil which see Fig. 2, including pivoted clincher-dogs 5 is positive in action and capable of locking the which are rocked upwardly to bend over the legs 85 anvil in its two different positions of adjustof the staple '60 Clinch them against the underment. side of the work in the usual manner well known Another .object of the invention is to provide to those versed in the art.

actuating means for the anvil which is .strong The bonnet or head 2 may be fastened to the and sturdy in construction, proof against deforward end of the arm 3 by One 0r more bOlGS 90 rangement or getting out of order and durable 'l and its upper, rearward portion recessed to in operation throughout extended periods of provide space for a crank-motion which actutime. ates the reciprocatory elements of the staple- Further objects of the improvement are set forming and driving mechanism. As shown in 40 forth in the following specification which de- Fig. 1, a horizontal drive-shaft 10 is journaled 95 scribes a preferred form of construction of the in a bushing 11 supported by a bearing 12 at invention, by way of example, as illustrated by the forward end of the arm 3; the rearward end the accompanying drawings. of the shaft carrying a driving pulley orother In the drawings: suitable power-transmission element, not shown,

Fig. 1 is avertical, sectional view of a stitcherwhich is adapted to be coupled to the shaft 100 head or bonnet shown as mounted on the arm of through the means of a clutch or the like. At a power-driven stitching machine and connectthe rear of the bonnet 2 is a bracket 13 having ed to the driving mechanism thereof; a downwardly extending portion 14 which sur- Fig. 2 is a front elevation ofthe stitcher-head rounds the bushing 11 held in the bearing 12 in or bonnet shown with its front cover or facethe arm 3. The bracket 13 is secured to the 105 plate in place thereon and illustrating the relaupper part of the arm 3 by a screw 15, thereby t-ion of the stitching mechanism to the clincherserving as an auxiliary support or stiifening device; member for the bonnet 2.

Fig. 3 is a similar front view of the stitcher- At the forward end of the drive-shaft 10 is a bonnet shown with its face-plate removed and crank-disk 16 carrying an eccentrically disposed 110 crank-pin 17. Connected to the crank-pin 17 is a link- 18 the lower end of which is pivotally joined to a stud 19 projecting rearwardly from a slide 20. The slide 20 constitutes the reciprocating means for the staple-former or benderbar and the staple-driver, to which it imparts v vertical movement within the head or bonnet 2.

During the rotation of the drive-shaft 10 the crank-pin 17 oscillates the link 18 to reciprocate the slide 20. Preferably, the slide 20 and other reciprocating parts of the mechanism are provided with splines or guides which slide in grooves 21 at the sides of the bonnet 2.

As in the machine of the prior patent hereinbefore referred to, a staple-former or benderbar 25 and a driver-bar 26 are actuated from the slide 20 through the means of a yieldable connection which prevents damage to or breakage of the parts should the work being operated upon be thicker than intended for the setting of the machine. The driver-bar 26 is connected to the slide 20 by means of a slidable plunger 30 which is free to move vertically in a guideway 31 at the front of the slide. Held in a pocket 32 above the guideway 31 is a helical spring 33, the lower end of which seats in a pocket in the plunger 30. The rearward side of the plunger 30 is notched to form a shoulder 34 which engages a cross-pin 35 in the guideway 31 to limit the downward movement of the plunger 30 under the action of its spring 33. In the forward side of the plunger 30 is a slot 36 engaged by a key or projection 37 at the upper end of the driverbar 26. The driver-bar 26 is thus connected to the plunger 30 and the spring 33, being relatively stiff, acts to maintain the plunger at the lower limit of its movement so that normally the driver-bar 26 is reciprocated with the full extent of stroke of the slide 20. Should the movement of the staple-driver be resisted, however, the spring 33 is adapted to yield to permit the slide 20 to continue its stroke without carrying the driver-bar 26 to the end of its normal stroke.

The staple-driver consists in a relatively flat blade 40 suitably secured to the driver-bar 26 to be reciprocated therewith to cause its lower edge to impinge against the staple to drive it into the work. The staple-former or benderbar 25 comprises an H-sliaped member having splines on its sides slidable in the grooves 21 in the sides of the bonnet 2. The bender-bar 25 is connected to be reciprocated by andwith the driver-bar 26 through the means of a frictional coupling as next described. Screwed into an opening in the upper part of the bender-bar 25 is a cylindrical bushing or thimble 41 in which is sldably mounted a plunger-pin 42. A helical spring 43 surrounding the shank 44 of the plunger-pin 42 bears against the end of the thimble 41 to press the pin against the face of the driver-bar 26. Thus, as the driver-bar is reciprocated the frictional contact of the plunger-pin 42 thereagainst will cause the benderbar 25 to be moved therewith.

Pivoted to the rearward side of the bender-bar 25 is a staple-supporter 45 which projects downwardly therebelow and is formed with an inclined face 46 for supporting the 'staple as it is forced downwardly in the grooves of the benderbar by the driver 40. The staple-supporter 45 is rocked to a rearward position by the engagement of pins 47 on its sides with cam-shaped projections 48 on the sides of the bonnet 2. As the bender-bar descends past the forming anvil, to be next described, the staple-supporter rocks forwardly to receive the staple with its legs in straddled relationship thereon after the staple is released from the forming anvil. The staplesupporter 45 is rocked forwardly by means of a pivoted arm 49 carrying a roller 50 ,which engages a beveled face 51 on the supporter during the descent of the latter. The arm 49 is urged forwardly under the tension of a spring 52 pocketed in a bore in the end of a stud 53 screwed into the rearward wall of the bonnet 2.

The forming anvil 55, with which the present invention is particularly concerned, is of a construction similar to that shown and described in the patent hereinbefore referred to and illustrated in Fig. 6 of the present drawings. It consists of a cylindrical body or barrel portion 56 at one end of which is a knurled head 57. The opposite end of the anvil 55 is formed with a relatively deep transverse groove 58 which is bisected by a shallower groove 59 extending at right-angles thereto. Normally, the anvil 55 is held in position as shown in Fig. 6 with the deeper groove 58 extending vertically and the opposite groove 59 in horizontal position. The wire w, indicated in Figs. 1 and 2, is fed downwardly from a source of supply, usually arranged above the machine but not herein shown, and its lower end caused to pass through the groove 58 in the anvil 55, this operation being' performed by suitable wire-feeding means indicated generally at 60 in Fig. 3 of the drawings as comprising a gripper 61. The anvil 55 is rotated back and forth about its axis throughout an angle of ninety degrees. At the first rotation of the anvil 55, before the wire is severed the Wire slides out of the groove 58 and enters the groove 59 where it is caught and held by the end of a resiliently operated pawl 68. The pawl 68 is held in a longitudinal slot 69 in the barrel 56 of the anvil 55 and pivoted on a transverse pin 70. As before noted, the anvil 55 is of substantially the same form as that described in the prior patent hereinabove referred to, its slotted end being provided with beveled faces 71 and 72 which cause the wire to ride thereover in its transfer from the deeper groove 58 to the shallower groove 59.

After the wire has been transferred from the groove 58 to the groove 59 in the anvil 55 by the rotation of the latter it is severed at a point above the anvil by the coaction of a pair of cutters 62 and 63 shown in Fig. 2 of the drawings. The wire-feeding and cutting-off mechanisms are similar in construction and method of operation to those shown in the prior patent referred to and therefore will not be herein described in detail. After a length of Wire has been cut off from the main length the anvil 55 is turned back in the opposite direction to position the severed length w' held in the groove 59 in horizontal position as illustrated in Fig. 6.

Referring now to Figs. 1, 2 and 3, the anvil 55 is mounted for rotation in a bearing 75 formed in an arm 76 which projects across the front of the head or bonnet 2. Normally, the anvil 55 is seated in its bearing 75 with its head 57 abutting the front face of the arm 76. In this position the opposite beveled end of the barrel 56 of the anvil projects beneath the lower edge of the staple-driver 40 while the groove 58 is positioned in alinement with the wire w which is fed down by the gripper means 61. Projecting from the top of the anvil 55 is a pin 77 which is received in a cam-shaped slot 78 in the side of the arm or bearing member 76. The

and proportioned as to perslide axially of its bearing and also to rotate on its axis through an angle of ninety degrees, see dotted lines in Figs. 2 and 3. The anvil 55 is rotated by means of a crankpin 79 projecting from the end of a link 80 and engaging in a hole 81 in the head 57 of the anvil, the hole being disposed in eccentric relation to the. axis of rotation of the anvil.

In the machine of the patent hereinbefore referred to the means for rotating the stapleforming anvil consists of a Geneva-motion, socalled, actuated by the reciprocatory movement of the slide 20. This -previous type of mechanism, while generally eilicient for the purpose indicated, has certain disadvantages such as its liability to wear and mutilation. It is therefore one object of the present invention to provide an improved means for translating the reciprocatory movement of the slide 20 into a rotary movement for the staple-forming anvil 55, which means is constructed and arranged as next described.

As in the machine of the patent hereinbefore referred to, rotary motion is transmitted to the anvil 55 through the oscillating action of an eccentric hub or boss 85 pivoted on a stud 86 projecting from the front of the bonnet 2, see Fig. 4. The stud 86 is locked in place by a screw 87 threaded into its reduced shank portion with the head of the screw seated in a counterbore 88 in the rearward side of the bonnet 2. The eccentric-hub 85 is provided with a hole 89 spaced from the bearing hole for the stud 86 and adapted to receive a crank-pin or headed stud 90. The crank-pin 90 vis fast in the end of the connecting rod or link previously referred to as carrying a pin 79 at its lower end engaging the eccentrically disposed hole 81 in the head 57 of the anvil 55. It will be apparent that through these connections the .oscillating movement of the eccentric-hub will be communicated through the link 80 to oscillate the anvil 55 in the opposite direction, the arrangement of the parts being similar to -that shown in the prior patent before referred to.

The means for oscillating the eccentric-hub 85 comprises a pair of arms projecting more or less radially from its side, these arms being preferably constituted in a hook-like or substantially L-shaped member or lever 95 shown in perspective view in Fig. 5. The two arms 96 and 97 of the lever 95 are joined by a curved portion 98 having its edge shaped to conform to the periphery of the eccentric-hub 85. As indicated in Fig. 5 of the drawings, the side of the lever 95 abuts the flat end of the hub 85, the lever being provided with a hole 99 for the bearing stud 86 to adapt it to rock about the axis thereof with the motion of the hub. The lever 95 is keyed to the hub 85 by means of a pin or stud 100 projecting from its side into the opposite end of the hole 89 in which the crank-pin is engaged. In this manner the lever is constituted as a part of the eccentric-hub 85.

Referring to Fig. 2 of the drawings, the lever 95 normally stands in the position indicated in this view with its longer arm 96 vertically disposed and engaging against the side of a pin 103 which projects rearwardly from a face-plate 94 secured to the front of the head or bonnet 2. The pin 103 serves as a stop for limiting the turning movement of the lever 85 in counterclockwise direction. Projecting from the slot 78 is so formed mit the anvil 55 to front of the slide 20 is a pin or stud 105 which, when the slide is in its uppermost position as shown in Fig. 2, engages with the opposite side of the arm 96 of the lever 95 so that the latter is restrained from moving in either direction. As the pin 105 is carried downwardly during the descent of the slide 20 it rides into the curved neck of the other arm 97 of the lever 95. The continued movement of the stud 105 will therefore cause it to act against the arm 97 of the lever 95 to rock the latter in a clockwise direction with the stud riding out onto the end of the arm 97 and eventually assuming the position shown in Fig. 3 with the squared end of the arm abutting the side of the stud. During this turning movement of the lever 95 under the reciprocating motion of the stud 105 the eccentric-hub 85 will be rotated or oscillated about its bearing stud 86 to turn the crank-pin 90 through an arc of somewhat less than ninety. degrees. Under this motion of the eccentrichub 85 the link 80 transmits rotary motion to the anvil 55 to turn the latter through an are of ninety degrees. On the other hand, the upward movement of the slide 20 causes the stud 105 to engage the arrn 96 of the lever 95 to rock the latter in the opposite direction.

The method of voperation of the staple-forming and driving mechanism and the coordinated action of the anvil is as next explained. The drive-shaft 10 of the stitching machine is driven through its clutch connection with the power means, previously referred to, and thereby the crank-disk 16 is given a continuous rotary motion to oscillate the link 18 connected to its crank-pin 17. The link 18 transmits reciprocating motion to the slide 20 which slides up and down between the sides of the bonnet 2, the driver-bar 26 and bender-bar 25 being connected for reciprocation by and with the slide 20 in the manner as previously explained.

With the driver-bar 26 and bender-bar 25 at the upper end of their stroke, as illustrated in Fig. 1 of the drawings, the anvil 55 is projected into position with its beveled and slotted end beneath the staple-driver 40; it being noted, that the connecting rod or link 80 is bowed slightly throughout its length to subject it to spring tension whereby it tends to seat the head 57 of the anvil 55 against the outer face of the bearing 75 in the arm 76.

The wire-feed is operated to feed the wire w downwardly during the downward stroke of the staple-driver and bender-bar and after a predetermined length of wire has been pushed through the groove 58 in the end of the anvil 55 the latter is rotated by its actuating means' which operates as next explained.

Assuming, for convenience of explanation, that the staple-driver 40 and bender-bar 25 are at the lower end of their stroke, as shown in Fig. 3, the anvil 55 will be forced outwardly in its bearing 75 by the driver and rendered free to turn therein. As the bender-bar and stapledriver start to rise with the slide 20 the stud 105 on the slide rides off from the end of the arm 97 of the lever 95 and engages with the side of the arm 96 which is disposed in inclined position across the path of the stud as shown in Fig. 3. As the stud 105 continues upwardly it rides along the side of the arm 96 of the lever 95 to rock the latter into the position indicated in Fig. 2. As the lever 95 is turned in this manner the eccentric-hub 85 is rotated in a counterclockwise direction to raise the link 80,

The upward movement of the link acts through the crank-pin 79 to rotate the anvil 55 in a clockwise direction, turning it to the position illustrated in Figs. 1 and 2. Meanwhile, the staple-driver 40 has been raised with the driver-bar 26 and the anvil 55 is moved axially of its bearing '75 to project its end into position to receive the wire w in its slot 58. In the meantime, however, the length of wire which was previously fed into the groove 58 of the anvil before Athe turning of the latter has been transferred from the groove 58 tothe groove 59 and severed from the main length. Therefore, during the turning of the anvil 55 in a clockwise direction in the manner as last explained, the length of wire w' in the groove 59 is shifted into horizontal position as indicated in Figs. 1, 2 and. 6.

At the next descent of the slide 2G the benderbar 25, moving therewith, is caused to cooperate with'the anvil 55 to bend down the ends of the length -of wire w projecting at either side of the barrel of the anvil lto form the legs of the staple. That is to say, the bender-bar 25 slides downwardly .with its legs straddling the sides of the barrel 56 of the anvil 55 and impinging against the projecting ends of the length of wire w to bend these ends downwardly. The staple-driver 40 moves downwardly with the bender-bar 25 but its lower edge, being spaced above the ends of the legs of the bender-bar, does not engage the wire until the staple has been formed. Eventually, the lower Aedge of the staple-driver 40 rides against the beveled end of the anvil 55, thereby acting to force the latter axially through its bearing 75. At this juncture, the face 46 of the staple-supporter 45 rides in under the head of the staple so that as the anvil 55 recedes from the plane of the driver the staple is released from the slot 59 and transferred to the supporter. As the descent of the stapledriver 40 continues it forces the staple downwardly between the legs of the bender-bar 25 to drive its legs into the work, the ends of the legs of the bender-bar meanwhile bringing up against the top of the work as shown in Fig. 3 to clamp the papers or other articles xedly in position. It will be understood that when the downward movement of the bender-bar 25 is arrested by its legs contacting with the Work, the staple-driver still continues its movement to lthe end of the stroke as provided for by the friction connection between the bender-bar and the driver-bar 26 which permits lost motion between these parts.

As the legs of the staple are driven through the work the clincher-dogs 5 are rocked upwardly through the operation of means not herein shown but described in the patent before referred to. As the upper grooved edges of the dogs 5 meet the ends of the legs of the staple they bend them inwardly to clinch them against the underside of the work in the usual manner.

Upon completion of the setting and clinching of the staple the bender-bar 25 and stapledriver 40 start to rise in the bonnet 2 with the upward sliding movement of the slide 20.

The actuation of the lever 95 during the descent of the bender-bar and staple-driver is as next explained. During the first downward movement of the slide 2O thepin 105 rides along the extended side of the arm 96 of the lever 95 without moving the latter. When, however, the stud 105 reaches the curved neck of the arm 97 it forces this arm downwardly to rock the lever 95 in a clockwise direction. Under this latter rocking motion of the lever 95 the eccentric-hub is turned to rock the crank-pin 90 downwardly whereby to transmit motion through the link 80 to turn the anvil 55 in a counterclockwise direction. This latter rotative movement of the anvil 55 turns it into position to transfer the wire from the deeper groove 58 to the shallower groove 59 in the manner as'before indicated. The anvil 55 is thus turned back and forth with each complete stroke of the benderbar and staple-driver whereby to cause it to receive the end of the fed wire, transfer the wire from one groove to the other in the anvil, after which the wire is severed, and then shift the position of the severed length to dispose it horizontally beneath the bender-bar.

The means for rotating the anvil as embodied in the present invention are simple in construc-` tion, positive in action and durable in use over long periods. It will be noted that the cooperating parts are all of substantial size with extended engaging surfaces to provide for long wear. Moreover, the parts are devoid of sharp points, notches and the like as in a Geneva-motion so that there is less liability of wear and breakage of the elements. v

While the invention is herein shown as embodied in a preferred form of construction, it is to be understood that variations may be made in the form and arrangement of its parts without departing from the spirit or scope of the invention. Therefore, without limiting myself in this respect, I claim:

1. In a stapling or wire-stitching mechanism, the combination of a rotary anvil, a reciprocating member, and means for translating the reciprocatory motion of said member to oscillatory motion of the anvil comprising a rockable lever having two arms disposed at an angle to each other, and means on the reciprocating member engaging alternately with the arms when moving in opposite directions to rock said lever to oscillate the anvil.

2. In a stapling or wire-stitching mechanism, a rotary anvil, a reciprocating element, a rockable lever having arms disposed angularly with respect to each other, means for connecting said lever to oscillate the anvil, and means on the reciprocatory element engageable with rst one arm and then the other arm of the lever to rock the latter.

3. In a device of the type indicated, the combination of a rotary anvil, a rockable two-armed lever, means for connecting said lever to impart oscillating movement to the anvil, a reciprocating element, and means on said element slidable along one arm of the lever to engage with the opposite arm to rock the lever.

4. In a stapling or wire-stitching machine, the combination of a rotary anvil, a rockable twoarmed lever, a link connecting said lever to oscillate the anvil, a reciprocatory element, and means on said element adapted to slide along one arm of the lever to engage its opposite arm to rock the lever in one direction and to alternately ride away from said last-named arm to engage the first arm to rock the lever in the opposite direction.

5. In a stapling or wire-stitching machine, the combination of a rotatable anvil, a pivoted hub, an eccentric crank-pin on the hub, a link connecting the crank-pin on the hub to oscillate the anvil, arms on the hub projecting. substantially radially of its pivotal axis, and means reciprocaone arm and then the other oscillatory moble to engage rst arm to rock the hub to transmit tion to the anvil.

6. In a fstapling or wire-stitching machine, the combination of a reciprocating member, a rotary anvil, a rotary element having a substantially radial arm adapted to extend in the direction of movement of the reciprocating member and a second arm extending across the path of the reciprocating member, means on the reciprocating member adapted to ride along the side of the first arm of the rotary element to effect a dwell in the motion thereof and to engage the second arm to rock the rotary element, said means engaging the rst arm during its travel in the opposite direction to return said rotary element to first position with a dwell in its motion at the end of the movement of the reciprocating member, and means connecting the rotary element to oscillate the anvil in synchrony therewith.

7. In a stapling or wire-stitching machine, the combination of a reciprocating member, a rotary element having an arm overlying the reciprocating member, said arm formed with a straight side adapted to extend in the direction of the path of said member and a second arm overlying and crossing the path of the reciprocating member and formed with a curved edge, and a stud on the reciprocating member adapted to ride along the straight side of the rst arm and to engage in the curve of the second arm to rock the rotary element in one direction and upon its return movement to engage the first arm to return the rotary element to first position while causing it to dwell at the end of the stroke of the reciprocating member and throughout the rst part of the next stroke of the latter.

8. In a stapling or wire-stitching machine, the combination of a reciprocating member, a rotary lever having arms overlying the reciprocating member, one arm formed with a straight side extending in the direction of movement of the reciprocating member and another curved arm extending across the path of the reciprocating member and formed with a squared end, and a stud on the reciprocating member adapted to ride along the straight side of the nrst arm and to engage the curved side of the second arm to rock the rotary lever in one direction and to thereafter engage with the squared end of the curved arm to prevent retrogressive movement of the lever.

9. In a device of the type indicated, the combination of a rotary anvil, a pivoted hub, a crank-pin on the hub, a second crank-pin on the anvil, a link connecting said crank-pins, two arms extending laterally from the hub in angular relation to each other, a reciprocating member, and means on said member adapted to ride along one of said arms and to engage with the opposite arm to rock the hub in one direction and during the return movement of the reciprocating member to ride along the side of the first arm to return the hub to rst position.

10. In a wire-stitching mechanism, the combination of a reciprocatory bender-bar, a rotary anvil cooperating With the bender-bar for holding a length of wire during the formation of a staple, a slide for reciprocating the bender-bar, a rockable lever having opposite arms disposed at an angle to each other, means connecting the lever to oscillate the anvil, and means on the slide adapted to ride along the side of one arm of the lever to engage its opposite arm to rock the lever to turn the anvil in one direction, said means engaging against the other arm of the lever during movement in the opposite direction to return the lever to rst position.

11. In a wire-stitching mechanism, the combination of a bonnet, a staple-forming anvil rotatably mounted on said bonnet, a slide reciprocable on the bonnet, means for reciprocating the slide, a bender-bar actuated from the slide to cooperate with the anvil to bend a length of wire held therein to form a staple, an L- shaped lever having two arms disposed in angular relationship, means connecting said lever to oscillate the anvil, and means on the slide engageable first with one arm and then with the other arm of the lever during the reciprocating movement of the slide to rock said lever.

12. In a wire-stitching machine, the combination of a bonnet, an anvil rotatably mounted on the bonnet, a slide reciprocable with respect to the anvil, a bender-bar actuated from the slide to cooperate with the anvil to form a staple from a length of wire held therein, a lever pivoted to the bonnet and provided with opposite arms disposed in angular relationship, a pin on the slide engageable alternately with the opposite arms of the lever to oscillate the latter during the reciprocation of the slide, means for reciprocating the slide, and means for connecting the lever to oscillate the anvil.

13. In a wire-stitching mechanism, the combination of a bonnet, an anvil rotatably mounted on the bonnet, a slide reciprocable on the bonnet, a bender-bar actuated from the slide to cooperate with the anvil to form a staple from a length of wire held therein, a stud projecting from the bonnet, a hub pivoted on said stud, a two-armed lever also pivoted on the stud, a crank-pin extending through an eccentric hole in the hub, a pin on the lever engaging the eccentric hole in the stud to key the lever with the hub, a crankpin on the anvil, a link connecting the crankpins, and means on the slide adapted to engage alternately with the opposite arms of the lever to rock the latter to transmit motion through the link to oscillate the anvil.

HARRY T. MCCLURE. 

